code: def test_fusion():
      std1 = sensor_fusion_test()
      std2 = single_measurement_test()
      assert std1 < std2
  
file_path: filterpy/filterpy/kalman/tests/test_sensor_fusion.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import numpy.random
  from numpy.random import randn
  import numpy
  import matplotlib.pyplot
  from filterpy.kalman import KalmanFilter
  from numpy import array, asarray
label_desc: Use image node_id 3 for calling a global function with example usage: test_fusion() without return types